TLDR: There is a new exciting community slack channel where you can find a mentor, a mentee or both if that floats your boat. The great Chrissy LeMaire (https://twitter.com/cl) from dba tools and sqlcommunity.slack.com fame and general Powershell and SQL legend has started a new mentor's slack channel.
Come and join the fun, it is a community-driven informal process. I have put up a google docs sheet with a list that people can add themselves to or use to contact other people who might be a good fit for them.